17.03.2021

Non-s-wave superconductivity in noncentrosymmetric ThCoC2 – online seminar


The AGH UST Academic Center for Materials and Nanotechnology invites to a virtual seminar in the series Krakow Condensed Matter Seminar”, which will be held on 17th March 2021, at 9.00 am.

A lecture titled “Non-s-wave superconductivity in noncentrosymmetric ThCoC2” will be presented by Professor Bartłomiej Wiendlocha (AGH UST, Faculty of Physics and Applied Computer Science).

Link for participants

Abstract

ThCoC2 is a noncentrosymmetric superconductor, in which recently, superconductivity was proposed to be a nodal d-wave and mediated by the spin fluctuations [1]. In our work [2] electronic structure, phonons and electron-phonon coupling are studied in ThCoC2 on the basis of ab initio computations. The thermodynamic properties of the superconducting state are determined numerically by solving Eliashberg equations. Our results support the electron-phonon coupling scenario of superconductivity in ThCoC2, in contrast to [1]. However, calculated temperature dependence of the electronic specific heat and magnetic penetration depth strongly deviate from the BCS model. Moreover, neither the BCS model nor the presented Eliashberg solutions can explain their experimentally observed temperature dependence, supporting the non-s-wave picture of superconductivity in ThCoC2. To resolve the pairing mechanism two experimental measurements are proposed.

References:

[1] A. Bhattacharyya et al. Phys. Rev. Lett. 122, 147001 (2019)
[2] G. Kuderowicz, P. Wójcik, B. Wiendlocha, to be published (2021)